The 14-A, the world’s first all-electric compact calculator, was invented by Toshio Kashio in 1957. It was fitted with 341 relays. Since most calculators at the time were mechanical gear-based devices, the all-electric 14-A drew attention for its functions, computing speed and quiet operation. Vastly superior to a mechanical calculator, it was well received. The 14-A is a landmark calculator and can also be found at the National Museum of Nature and Science in Ueno, Japan and at the Smithsonian in the United States.

Relays, the key component in the 14-A

The 14-A, the world's first compact all-electric calculator
(on display in the Invention Room)

Invention Room

The 14-A, the world’s first all-electric compact calculator, is on display in this room. It was invented by Toshio Kashio and his brothers.

A relay, the key component of the 14-A

Description of the actual relay the Kashio brothers developed for the 14-A, and the design improvements for increasing durability and reliability

AL-1 (1962)

Pioneering calculator for science and technology. A relay calculator to perform scientific and technology calculations using gear-type programs

Numbers Room: Calculators

This room showcases calculators developed by Casio engineers based on the ideas inherited from Toshio Kashio

Casio Mini changes calculator history (1972)

Originally, calculators were practical only for large offices, maybe one per department. Finally, with the Casio Mini, every home—indeed every person—could have a calculator. It had an innovative 6-digit display (12-digit calculation). After its release, the Casio Mini sold 1 million units in 10 months and became a major hit product with total sales of 6 million units for the series. In 2008, it was registered as an Essential Historical Material for Science and Technology by Japan’s National Museum of Nature and Science.

001 (1965)

First transistor calculator with onboard memory. It displayed seven digits using number dials

AL-1000 (1967)

World's first calculator enabling the use of the keypad to easily enter of a series of instructions into the memory

Calculator Clock CQ-1 (1976)

World's first electronic clock with time display, alarm, stopwatch, and four calculator functions

SL-800 (1983)

True credit card sized calculator, with a slim profile of just 0.8 millimeters, achieved by engineering electronic components on film. In 2013, it was registered as an Essential Historical Material for Science and Technology by Japan’s National Museum of Nature and Science

Sound Room: Musical Instruments

This room holds a collection of Casio electronic keyboards, digital guitars, and electronic wind instruments developed to allow many people to discover the joy of performing music.

Casiotone 201 (1980)

Electronic keyboard equipped with Casio's own Consonant-Vowel System that recreates the sound of various acoustic instruments

SK-1 (1986)

Sampling keyboard that allows anyone to easily process various sounds such as human voices or rain, and then play them as a sound source

Time Room: Wristwatches and ADPS

The Time Room contains watches that boast Casio's original electronics technology, as well as Active Data Processing Systems (ADPS) used for processing office information.

Casiotron (1974)

World's first wristwatch equipped with a calendar function that automatically determines the number of days in the month

BM-100WJ (1989)

Sensor watch that can measure atmospheric pressure, altitude, and water depth, using built-in microchip pressure sensors

ADPS R1 (1989)

Office data processing device that did not require the user to set up a program, developed based on Casio's own ADPS Theory

Creativity Room

This room was Toshio Kashio’s study. He worked on his inventions for hours in this room, sometimes even forgetting to go to bed.